but there's more focus on what the u.s. would do if the syrian regime did use chemical weapons on opposition forces. there's no good military option. you don't want to bomb chemical sites. and a ground operation could take 75,000 troops. josh? >> scenarios no one wants to see come to pass. martha, thanks for that. >>> we're following a developing story in northern ireland. a possible bomb plot targeting secretary of state hillary clinton who is visiting today. police there are questioning four suspected i.r.a. members after they were found carrying explosives in their car. >>> the government releasing the month li jobs report. bettering that expected. the unemployment rate dropping to a four-year low. though some people did stop looking for work. hurricane sandy did disrupt hiring. but not as badly as expected. >>> and a major blow to union rights in michigan. republican lawmakers there have pushed through right-to-work bills. hundreds of activists stormed the capitol, protesting the legislation, which would ban unions from